Trump announced this week the hiring of a new CEO, Stephen Bannon from Breitbart News, and campaign manager, Kellyanne Conway, a pollster who was already with the campaign.

Another former top Trump campaign aide, Corey Lewandowski, got the boot in June.

“This morning Paul Manafort offered, and I accepted, his resignation from the campaign,” Trump said in a statement.

“I am very appreciative for his great work in helping to get us where we are today, and in particular his work guiding us through the delegate and convention process,” he added. “Paul is a true professional and I wish him the greatest success.”

The resignation comes as Manafort was revealed to have deep — and perhaps ongoing — financial ties to pro-Russia forces in Ukraine.

Hillary Clinton’s campaign used the Manafort departure to attack Trump’s coziness with Russian President Vladmir Putin.

“Paul Manafort’s resignation is a clear admission that the disturbing connections between Donald Trump’s team and pro-Kremlin elements in Russia and Ukraine are untenable,” said Clinton campaign manager Robby Mook.